이거 왜 오류가 뜨는건가요?

<div data-inven-prevent="contextmenu,drag,select">

<div data-inven-tabs="main">

<div style="float: left;">

<div data-inven-tab-for="maplestory"

data-inven-selected-css="{'_SELF_':{'margin-left':'0px'}}"

 data-inven-unselected-css="{'_SELF_':{'margin-left':'-8px'}}" 

style="width: 12px; padding: 2px; margin: 6px 0; cursor: pointer; text-align: center; border: none; background-color: orange; color: white; transition: 0.2s;">메이플</div>

</div>

<div style="margin-left: 25px; padding-top: 15px; padding-bottom: 10px; padding-right: 10px;">

<div data-inven-tab-id="maplestory" style="border: 2px orange solid;">

<div data-inven-tabs="maple-main">

<div style="float: top;">

<div data-inven-tab-for="maple_info"

 data-inven-selected-css="{'_SELF_':{'fontWeight':'bold'}}"

 data-inven-unselected-css="{'_SELF_':{fontWeight':'normal'}}" 

style="height: 12px; width: 80px; padding: 6px; cursor: pointer; text-align: center; border: none; background-color: black; color: white;">기본 정보</div>

</div>

<div data-inven-tab-id="maple_info" 

style="height: 472px; background: url('https://optimal.inven.co.kr/upload/2019/02/24/bbs/i15323399555.png') no-repeat; font-size: 20px; font-weight: 1000; font-family: 'Nanum Gothic';">

어느덧 메이플 13년차에 접어든 메린이시당

<img src="https://optimal.inven.co.kr/upload/2019/03/02/bbs/i16156352195.png" height="250">

<img src="https://optimal.inven.co.kr/upload/2019/03/02/bbs/i16126344079.png">

</div></div>

</div>

</div>

</div>

</div>

[invenCustomAction-error] :: Unexpected token f in JSON at position 11

요런 에러창 뜨는데 원인이 뭔가요?